Ternary Cooperative Interface With Electronegative Phosphine Bridges Enables Efficient and Stable Inverted Perovskite...

Area of Science:

• Materials Science
• Renewable Energy
• Organic Electronics

Background:

• Carbazole-based self-assembled monolayers (SAMs) are crucial for high-performance perovskite solar cells (PSCs).
• Single-component SAMs exhibit limitations like incomplete substrate coverage and weak perovskite interactions, causing defects and stress.

Purpose of the Study:

• To engineer a synergistic interface strategy for improved PSC performance.
• To overcome limitations of single-component SAMs by creating a ternary cooperative interface.

Main Methods:

• Developed a ternary cooperative interface (Co-SAM@TFMP) using co-adsorbed SAMs (Me-4PACz, 4PABCz) and a phosphine molecule (TFMP).
• Utilized phosphonic and carboxylic acid groups for robust substrate anchoring.
• Employed TFMP as a molecular bridge to coordinate with Pb²⁺ and stabilize FA⁺, suppressing defects.

Main Results:

• Achieved complete interfacial coverage and strong substrate adhesion.
• Suppressed interfacial defects and alleviated crystallization stress during perovskite film growth.
• Optimized inverted PSCs reached a power conversion efficiency (PCE) of 26.78% and maintained 93.7% after 1200 hours of operation.

Conclusions:

• The ternary cooperative interface strategy effectively enhances PSC performance and stability.
• This approach promotes uniform, highly crystalline perovskite films.
• Offers a generalizable strategy for interface modulation in PSCs and optoelectronic devices.